The author makes it clear that he is not interested in throwing out the old tried and true existing Principles of War, he only wants thought given to their expansion to include a principle of Flexibility. After all, the hallmark of the course of instruction at the U.S. Army War College is the new environment in which its graduates should expect to operate--an environment that we at the War College characterize as vague, uncertain, complex and ambiguous. In such an environment, the author argues, Flexibility must be an operating principle, and it would serve all the services well to recognize it as such.